Display panel

ABSTRACT

The present invention provides a display panel including: a first input terminal group in which input terminals are disposed at intervals along first long side of a rectangular driver IC facing a panel end portion; a second input terminal group in which input terminals are disposed at intervals along the second long side of the driver IC facing a display section; a first wiring group connected to the first input terminal group, that extends under the first short side of the driver IC and extends out from between the driver IC and the panel body; and a second wiring group connected to the second input terminal group, that passes under the second long side of the driver IC and extends out from between the driver IC and the panel body.

Cross-Reference to Related Application

This application claims priority under 35 USC 119 from Japanese PatentApplication No. 2010-049657, filed on Mar. 5, 2010, the disclosure ofwhich is incorporated by reference herein.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a display panel.

2. Description of the Related Art

A conventional display panel that has narrowed frame by not providinggroups of wirings including transparent electrodes provided between apanel end portion of a panel body and a driver IC for driving a displayunit, so as to reduce an interval defined between the panel end portionand the driver IC, has been known.

Input terminals of the driver IC are normally disposed along a firstshort side of the driver IC. However, when the number of input terminalsis large, and the input terminals cannot be disposed along the firstshort side, the input terminals may be disposed along the first longside of the driver IC.

In such case, when the above method for aligning the input terminals isadopted, the number of input terminals which can be disposed along thefirst short side of the driver IC depends upon an interval definedbetween the input terminals. Therefore, the area of the driver ICbecomes greater to an increase in number of input terminals.

On the other hand, Japanese Patent Application Laid-open (JP-A) No.10-214858 discloses the configuration in which plural input terminals ofa semiconductor chip are disposed along first long side of thesemiconductor chip, and along the second long side of the semiconductorchip.

However, in the configuration disclosed in JP-A No. 10-214858, wiringsare drawn from both of the long sides of the semiconductor chip outwardof the driver IC. Therefore, the above configuration cannot be appliedto a display panel that has no wiring interposed between a panel endportion and the driver IC.

SUMMARY OF THE INVENTION

The present invention provides a display panel that may suppressincrease in area of a driver IC due to increased numbers of inputterminals.

A first aspect of the invention is a display panel including: a panelbody including a display section; a rectangular driver IC, providedbetween the display section and a panel end portion of the panel bodyand disposed with the display section in a longitudinal direction, whichdrives the display section; a first input terminal group in which inputterminals are disposed at intervals along a first long side of therectangular driver IC that faces the panel end portion; a second inputterminal group in which input terminals are disposed at intervals alonga second long side of the rectangular driver IC that faces the displaysection; a first wiring group that is connected to the first inputterminal group, that is formed on the panel body between the rectangulardriver IC and the panel body, that passes under a first short side ofthe rectangular driver IC and that extends out from between therectangular driver IC and the panel body; and a second wiring group thatis connected to the second input terminal group, that is formed on thepanel body between the rectangular driver IC and the panel body, thatpasses under the second long side of the rectangular driver IC and thatextends out from between the rectangular driver IC and the panel body.

According to the first aspect of the present invention, the first wiringgroup, that has reduced intervals between the wirings or the smallerwidth of the wiring than the first input terminal group, is disposedalong the first short side in the driver IC. Due thereto, in the firstaspect of the present invention, the input terminals of the first inputterminal group, that are to be respectively connected to the firstwiring group, is disposed, according to the number of the wires of thefirst wiring group that may be disposed (wired) along the first longside in the driver IC.

Therefore, according to the first aspect of the present invention, thenumber of input terminals that can be disposed may increase, since theinput terminals are disposed along the first long side in the driver IC,when compared with, for example, a case where the first input terminalgroup is disposed along the first short side in the driver IC. Moreover,the first aspect of the present invention may suppress the increase inarea of the driver IC due to increased number of input terminals.

In the display panel according to the first aspect, each of the wiringsis not drawn from the first long side in the driver IC to the panelbody. Accordingly, the present invention may be particularly effectivein a so-called “narrowed edge panel” in which a frame is narrowed byaligning no wire between a panel end portion and the driver IC.

Note that, the term “narrowed edge panel” refers to a panel providedwith configuration where no inputting wiring is formed between thedriver IC and the panel end portion.

A second aspect of the invention, in the above first aspect, the firstinput terminal group and the second input terminal group may besequentially disposed from an end portion of the first short side of therectangular driver IC; and wirings of the first wiring group that areconnected to the input terminals of the first input terminal group andthat are disposed further toward a second short side of the rectangulardriver IC than the second input terminal group, may extend out fromunder the second long side of the rectangular driver IC.

According to the above aspect, even when the number of the terminals inthe first input terminal group is increased, and some of the wirings inthe first wiring group may not extend out from the first short side ofthe driver IC, some of the wirings in the first wiring group may extendout from the second long side in the driver IC.

A third aspect of the invention, in the above aspects, a width ofwirings of the first wiring group that extend out from under the firstshort side of the rectangular driver IC may be smaller than a width ofthe input terminals of the first input terminal group and the secondinput terminal group.

According to the above aspect, when compared with, for example, a casewhere the first input terminal group is disposed along the first shortside of the driver IC, the number of input terminals that can bedisposed may be increased, since the width of the wiring in the firstwiring group is smaller than width of each terminal. Accordingly, theabove aspect of the present invention may suppress the increase in areaof the driver IC due to increased number of input terminals.

A fourth aspect of the invention, in the above aspects, intervalsbetween wirings of the first wiring group and intervals between wiringsof the second wiring group may be smaller than the intervals between theinput terminals of the first input terminal group and the intervalsbetween the input terminals of the second input terminal group.

According to the above aspect, when compared with, for example, a casewhere the first input terminal group is disposed along the first shortside of the driver IC, the number of input terminals that can bedisposed may be increased, since the interval between the wirings in thefirst wiring group is smaller than the interval between the terminals inthe first input terminal group. Accordingly, the above aspect of thepresent invention may suppress the increase in area of the driver IC dueto increased number of input terminals.

A fifth aspect of the present invention, in the above aspects, a numberof input terminals disposed along both of the long sides of therectangular driver IC may be larger than a number of input terminalsthat can be disposed at either short side of the rectangular driver IC.

According to the above aspect, when compared with, for example, a casewhere the first input terminal group is disposed along the first shortside of the driver IC, the increase in area of the driver IC due toincreased number of input terminals may be suppressed.

A sixth aspect of the present invention, in the above aspects, the firstwiring group may extend from the first input terminal group toward thesecond input terminal group, then may extend toward the first short sideof the rectangular driver IC before reaching the second input terminalgroup, and may extend under the first short side of the rectangulardriver IC; and the second wiring group may extend from the second inputterminal group toward the second long side of the rectangular driver IC,and may extend under the second long side of the rectangular driver IC.

According to the above aspect, the first wiring group may be wired inthe panel body between the first input terminal group and the secondinput terminal group of the driver IC.

A seventh aspect of the present invention, in the above aspects, therectangular driver may IC include a CPU interface and a driving circuit;and the first input terminal group and the second input terminal groupmay be groups of input terminals for the CPU interface and the powersource circuit.

According to the above aspect, the first input terminal group and thesecond input terminal group may work as groups of input terminals forthe CPU interface and the power source circuit.

An eighth aspect of the present invention, in the above aspects, thewirings of the first wiring group and the second wiring group may betransparent electrodes.

According to the above aspect, the first wiring group and the secondwiring group may be transparent electrodes.

According to the above aspects, the present invention provides a displaypanel that may suppress increase in area of a driver IC due to increasednumbers of input terminals.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments of the present invention will be described indetail based on the following figures, wherein:

FIG. 1 is a view illustrating the schematic configuration of a displaypanel according to an exemplary embodiment of the invention;

FIG. 2 is a functional block diagram illustrating the schematicconfiguration of a driver IC disposed on the display panel shown in FIG.1;

FIG. 3 is a view illustrating the arrangement of input terminals andoutput terminals in the driver IC illustrated in FIG. 2;

FIG. 4 is a partially enlarged view of the driver IC enclosed by a dotline X of FIG. 3;

FIG. 5 is a view illustrating the driver IC shown in FIG. 4, turned at180°; and

FIG. 6 is a partially enlarged view of a conventional driver IC.

DETAILED DESCRIPTION OF THE INVENTION

Hereinbelow, a description will be given of a display panel according toan exemplary embodiment of the present invention with reference to theattached drawings. Note that constituent elements having substantiallythe same functions will be designated by the same reference numeralsthroughout the drawings, and their explanations may be omitted.

FIG. 1 is a view showing the schematic configuration of a display panelaccording to an exemplary embodiment of the invention.

A display panel 10 of the exemplary embodiment according to the presentinvention includes a panel body 12 formed into a rectangular shape whenviewed from the front. At substantially the center of the panel body 12,a rectangular display section 14 is disposed so that a longitudinaldirection of the rectangular display section 14 matches with alongitudinal direction of the panel body 12.

One end of each transparent electrode 16, wired to the panel body 12, isconnected to the display section 14. To the other end of eachtransparent electrode 16, a driver IC 18 is connected.

The driver IC 18 is disposed between the display section 14 and a panelend portion 12A of the panel body 12 (i.e., the outer peripheral portionof the panel body 12) so that the driver IC 18 extends along the displaysection 14 in the longitudinal direction. Namely, the driver IC 18 isdisposed so that the longitudinal direction of the driver IC 18 matcheswith the longitudinal direction of the display section 14. The driver IC18 outputs a drive signal or the like, to the display section 14 throughthe plural transparent electrodes 16. Signal is input to the driver IC18 via plural transparent electrodes 20, that are connected to one endof the driver IC 18, and are connected to the panel body 12.

The other end of each of the plural transparent electrodes 20 iscollected within a flexible board 22, to be drawn outward of the panelbody 12, and is connected to a CPU (not shown), a voltage source device,or the like.

Note that, in order to achieve a narrowed edge, a space defined betweenthe panel end portion 12A and the driver IC 18 is made minimum by notwiring any transparent electrodes 20 therebetween. On the other hand,spaces for wiring the transparent electrodes 20 are defined in the panelbody 12 between the driver IC 18 and the display section 14 or in thepanel body 12 in the longitudinal direction of the driver IC 18. Notethat the term “narrowed edge panel” refers to a panel that has aconfiguration in which inputting transparent electrodes 20 (wirings) arenot disposed between the driver IC 18 and the panel end portion 12A, inorder to reduce the area of the panel body 12. In general, a signal isinput into the driver IC 18 from the outside of the display panel 10 viathe transparent electrodes 20. In this case, the flexible board 22, forexample, is overlapped on the side of the panel 12, and the driver IC 18is electrically connected to the transparent electrodes 20. Accordingly,when the transparent electrodes 20 are drawn between the driver IC 18and the panel end portion 12A, it is necessary to secure the space forthe overlap between the driver IC 18 and the panel end portion 12A,which may result in increase of area of the panel body. Therefore, inthe conventional display panel, the increase in area of the panel body12 has been suppressed by interposing no transparent electrode 20between the driver IC 18 and the panel end portion 12A.

Note that, since the length of the display section 14 in thelongitudinal direction is generally longer than the longitudinaldirection of the driver IC 18, the transparent electrodes 20 are drawnin a horizontal space of the driver IC 18.

Next, the driver IC 18 of an exemplary embodiment of the presentinvention is described in detail.

FIG. 2 is a functional block diagram illustrating the schematicconfiguration of the driver IC 18.

The driver IC 18 includes a CPU interface 100, a control circuit 102, apower source circuit 104, and a driving circuit 106.

The CPU interface 100 receives an input signal from the CPU (not shown),via the transparent electrodes 20 (i.e., signal wirings), and transmitsdata based on the input signal to the control circuit 102.

The control circuit 102 produces display data based on the data receivedfrom the CPU interface 100, and transmits the display data to thedriving circuit 106.

On the other hand, the power source circuit 104 receives a voltage fromthe voltage source device (not shown), via the plural transparentelectrodes 20 (i.e., power source wirings), generates a voltage requiredfor the driving circuit 106, and supplies the required voltage to thedriving circuit 106.

The driving circuit 106 outputs the voltage generated in the powersource circuit 104 and an output signal, in accordance with the displaydata, to the display section 14 in a desired drive waveform, via theplural transparent electrodes 16.

FIG. 3 is a view showing the arrangement of input terminals and outputterminals in the driver IC 18. Note that the wirings connected to eachof the terminals are omitted in FIG. 3.

Output terminals 200 are the output terminals for the driving circuit106 in the driver IC 18, that outputs the signal in the above desireddrive waveform. In order to provide a narrowed edge, the plural outputterminals 200 are disposed along a long side 18A facing the displaysection 14 in the driver IC 18. The other ends of the above pluraltransparent electrodes 16 are connected to the output terminals 200,respectively.

In contrast, input terminals 202 are the input terminals for the CPUinterface 100 and the power source circuit 104 in the driver IC 18, thatreceives the signals from the CPU (not shown) or the voltage from thevoltage source device (not shown). The plural input terminals 202 aredisposed at intervals along the first long side 18B of the driver IC 18that faces the panel end portion 12A, and are disposed at intervalsalong the second long side 18A of the driver IC 18 that faces thedisplay section 14.

Hereinafter, the plural input terminals 202 disposed with intervalsalong the first long side 18B of the driver IC 18 that faces the panelend portion 12A are referred to as a first input terminal group 204.Further, the plural input terminals 202 disposed at intervals along thesecond long side 18A of the driver IC 18 that faces the display section14 are referred to as a second input terminal group 206.

In order to suppress an increase in area of the driver IC 18, it ispreferred to sequentially dispose the first input terminal group 204 andthe second input terminal group 206 from the first short side 18C (aleft short side in FIG. 3) of the driver IC 18, and is preferred notform a group of input terminals or the like on the second short side 18D(a right short side in FIG. 3) of the driver IC 18. However, a dummyterminal may be disposed on the second short side 18D of the driver IC18 to enhance adhesion strength. Further, counterparts of the inputterminal group formed on the first short side 18C of the driver IC 18may be formed on the second short side 18D of the driver IC 18.

FIG. 4 is a partially enlarged view of the driver IC 18 enclosed by adot line X of FIG. 3.

The plural transparent electrodes 20 are connected to the first inputterminal group 204. Note that, hereinafter, the transparent electrodes20 connected to the first input terminal group 204 are referred to as afirst wiring group 300.

The first wiring group 300 is formed on the panel body 12 between thedriver IC 18 and the panel body 12. Further, the first wiring group 300extends from the first input terminal group 204 toward the second inputterminal group 206, then extends toward the first short side 18C of thedriver IC 18 on the way toward the second input terminal group 206, andthen extends out from between the driver IC 18 and the panel body 12through under the first short side 18C of the driver IC 18. In thiscase, a wiring that extends from the input terminal 202 formed rightside of a certain input terminal 202 (i.e., on the second short side 18Dside) circumvents a wiring drawn from the input terminal 202 formed leftside (i.e., on the first short side 18C side of the driver IC 18), andextends leftward above the wiring drawn from the input terminal 202formed on the left (i.e., on the second long side 18A side of the driverIC 18).

Note that some of the wirings (i.e., a wiring arranged lowermost in FIG.4) in the first wiring group 300 extends immediately toward the firstshort side 18 of the driver IC 18 without extending from the first inputterminal group 204 toward the second input terminal group 206, andextends out from under the short side 18C.

Further, the width of the wiring in the first wiring group 300 thatextends under the first short side 18C of the driver IC 18 is formedsmaller than width of the terminals in the first input terminal group204 and the second input terminal group 206.

Furthermore, the intervals between the wirings that extend from underthe first short side 18C of the driver IC 18 in the first wiring group300 is formed smaller than the intervals between the terminals of thefirst input terminal group 204.

On the other hand, rests of the above plural transparent electrodes 20are connected to the second input terminal group 206. Note that,hereinafter, the transparent electrodes 20 connected to the second inputterminal group 206 are referred to as a second wiring group 302.

The second wiring group 302 is formed on the panel body 12 between thedriver IC 18 and the panel body 12. Further, the second wiring group 302extends from the second input terminal group 206 toward the second longside 18A of the driver IC 18, and then extends from between the driverIC 18 and the panel body 12 through under the second long side 18A ofthe driver IC 18. Note that, some of wiring in the second wiring group302 (i.e., a wiring arranged lowermost in the second wiring group 302 inFIG. 4) does not extend from the second long side 18A to the panel body12, but extends from under the first short side 18C of the driver IC 18,as the first wiring group 300.

The interval between the wirings of the second wiring group 302 is madesmaller than the intervals between the terminals of the second inputterminal group 206.

When connecting the first wiring group 300 to the first input terminalgroup 204, while designing the display panel 10, the input terminal 202nearest to the first short side 18C of the first input terminal group204 is first connected. At this time, the number of wirings to beconnected to the input terminals 202 is the number of wirings that canpass between the first input terminal group 204 and the second inputterminal group 206, or less. Note that, in FIG. 4, maximum number ofwirings that can pass between the first input terminal group 204 and thesecond input terminal group 206 are wired. Further, when connecting thesecond wiring group 302 to the second input terminal group 206, it iswired from between the first input terminal group 204 and the secondinput terminal group 206 if there still remains a space capable ofallowing the wiring to pass therebetween. However, if there remains nospace, it is wired from the second input terminal group 206 toward thesecond long side 18A of the driver IC 18.

Next, explanation will be made on a configuration of a comparativeexample. The comparative example used herein illustrates theconfiguration of a conventional driver IC. FIG. 6 is a partiallyenlarged view of a driver IC in the comparative example. In a driver IC500 of the comparative example (hereinafter referred to as a comparativedriver IC 500), input terminals 502 are disposed at intervals along thefirst short side 500C of the comparative driver IC 500. In the casewhere the number of input terminals 502 is large such that the inputterminals 502 cannot be disposed along the first short side 500C, theinput terminals 502 are disposed at intervals along a long side 500A onthe side of a display section 14 in the comparative driver IC 500. Inthis case, the number of the input terminals 502 that can be disposedalong the first short side 500C of the comparative driver IC 500 dependsupon, not the intervals between wirings 504 connected to each of theinput terminals 502, but the intervals between the input terminals 502or the width of the input terminal 502. Further, when the number of theinput terminals 502 that cannot be disposed along the first short side500C increases, length of the long side 500A, in which the inputterminals 502 are disposed, increases. Accordingly, the area of thecomparative driver IC 500 increases.

On the other hand, according to the exemplary embodiment of theinvention, the first wiring group 300, having intervals or width thatare smaller than the intervals or the width of the input terminals ofthe first input terminal group 204, is disposed along the short side 18Cof the driver IC 18. Due thereto, according to the number of wires ofthe first wiring group 300 that can be disposed along the first shortside 18C of the driver IC 18, input terminals of the first inputterminal group 204 can be disposed along the first long side 18B of thedriver IC 18.

Accordingly, in comparison with the comparative driver IC 500, in whichthe input terminals 502 are disposed along the first short side 500C ofthe comparative driver IC 500, the input terminals 202 are disposedalong the first long side 18B of the driver IC 18, so that the number ofinput terminals 202 that can be disposed increases. Therefore, thepresent invention may suppress the increase in area of the driver IC 18due to increased number of input terminals 202.

Namely, in the exemplary embodiment of the present invention, since thefirst input terminal group 204 and the second input terminal group 206are disposed along the long sides 18A and 18B of the driver IC 18respectively, the area of the driver IC 18 also increases due to theincreased number of input terminals 202. However, in the comparativeexample, when the number the input terminals 502 (i.e., the inputterminals 502 disposed along the long side 500A of the driver IC 500)exceeds the number of input terminals 502 that can be disposed along theshort side 500C (namely, when the entire number exceeds 14 in FIG. 6),the present invention may suppress the increase in area of the driver IC18 due to increased number of input terminals 202, by the reduced amountof the intervals between the wirings or the width of the wiring of thefirst wiring group 300.

Further, according to the exemplary embodiment, even when the driver IC18 shown in FIG. 4 is turned at 180°, the wirings can be fixedly wiredin the panel body 12, as shown in FIG. 5. Therefore, both of right andleft alignments can be coped with (FIG. 4 and FIG. 5) even when nowiring can be wired between the driver IC 18 and the panel end portion12A.

The present invention is not limited to the above exemplary embodiment,and various modifications, alterations, and improvements can beimplemented.

For example, a case where the wirings connected to the first inputterminal group 204 and the second input terminal group 206 are thetransparent electrodes has been described, the wirings may not betransparent. In addition, materials of the electrodes are notparticularly limited, as long as they are conductive.

Moreover, in FIG. 4, a case where the first wiring group 300 extendsfrom the first input terminal group 204 toward the second input terminalgroup 206, extends toward the first short side 18C of the driver IC 18on the way toward the second input terminal group 206, and extends outfrom the short side 18C to the panel body 12, has been described.However, as long as the first wiring group 300 is extended from theshort side 18C to the panel body 12, its arrangement or shape underbelow the driver IC 18 may take any aspects. For example, the firstwiring group 300 may extend from the first input terminal group 204toward the short side 18C with a curve.

Further, as shown in FIG. 5, in a case where the number of inputterminals 202 formed downside becomes larger than the number of inputterminals 202 formed upside, a configuration in which the wiringsextending from input terminals 202 by the number of excessive inputterminals leftward are extended from upside can be applied to the casewhere wiring are extended from leftward, as shown in FIG. 4.

Note that, although the input terminals 202 are disposed with the equalintervals in FIG. 4, it is preferable to form input terminals withseparate intervals rather than equal intervals in consideration of acrosstalk with an adjacent terminal.

1. A display panel comprising: a panel body including a display section;a rectangular driver IC, provided between the display section and apanel end portion of the panel body and disposed with the displaysection in a longitudinal direction, which drives the display section; afirst input terminal group in which input terminals are disposed atintervals along a first long side of the rectangular driver IC thatfaces the panel end portion; a second input terminal group in whichinput terminals are disposed at intervals along a second long side ofthe rectangular driver IC that faces the display section; a first wiringgroup that is connected to the first input terminal group, that isformed on the panel body between the rectangular driver IC and the panelbody, that passes under a first short side of the rectangular driver ICand that extends out from between the rectangular driver IC and thepanel body; and a second wiring group that is connected to the secondinput terminal group, that is formed on the panel body between therectangular driver IC and the panel body, that passes under the secondlong side of the rectangular driver IC and that extends out from betweenthe rectangular driver IC and the panel body.
 2. The display panel ofclaim 1, wherein: the first input terminal group and the second inputterminal group are sequentially disposed from an end portion of thefirst short side of the rectangular driver IC; and wirings of the firstwiring group that are connected to the input terminals of the firstinput terminal group and that are disposed further toward a second shortside of the rectangular driver IC than the second input terminal group,extend out from under the second long side of the rectangular driver IC.3. The display panel of claim 1, wherein a width of wirings of the firstwiring group that extend out from under the first short side of therectangular driver IC is smaller than a width of the input terminals ofthe first input terminal group and the second input terminal group. 4.The display panel of claim 1, wherein intervals between wirings of thefirst wiring group and intervals between wirings of the second wiringgroup are smaller than the intervals between the input terminals of thefirst input terminal group and the intervals between the input terminalsof the second input terminal group.
 5. The display panel of claim 1,wherein a number of input terminals disposed along both of the longsides of the rectangular driver IC is larger than a number of inputterminals that can be disposed at either short side of the rectangulardriver IC.
 6. The display panel of claim 1, wherein: the first wiringgroup extends from the first input terminal group toward the secondinput terminal group, then extends toward the first short side of therectangular driver IC before reaching the second input terminal group,and extends under the first short side of the rectangular driver IC; andthe second wiring group extends from the second input terminal grouptoward the second long side of the rectangular driver IC, and extendsunder the second long side of the rectangular driver IC.
 7. The displaypanel of claim 1, wherein: the rectangular driver IC includes a CPUinterface and a driving circuit; and the first input terminal group andthe second input terminal group are groups of input terminals for theCPU interface and the power source circuit.
 8. The display panel ofclaim 1, wherein the wirings of the first wiring group and the secondwiring group are transparent electrodes.